Spectacles or goggles



15 and they are not easily Patented Feb. 18,v 1941.

PATENT QFFICE 2,232,455 SPECTACLES R GOGGLES Leon Hbrard, Lyon, Rhone,France Application October 16, 1937, Serial No. 169,509 In GermanyOctober 20, 1936 My invention relates to goggles or spectacles forprotecting the user against the dazzling action of intense light. 1 w

The spectacles generally used for this object comprise coloured lensesmade of glass. They are dangerous on account of the risk of breakage. Ithas been proposed to substitute cellulosic derivatives for the glass,butthe lenses then are rapidly scratched. 0n the other hand the known1'0 goggles modify the hues and their lenses are easily stained and haveto ,be frequently cleaned;

It has been proposed to use metallic plates perforated with a largenumber of fine holes. But these holes are easily clogged by dust or dirtcleaned. When the plate is not extremely thin, the edges of-the holesare brilliant and are themselves a source of glare.

A first object of my invention is to provide spectacles with perforatedplates which will not go easily become clogged by dirt.

A further. object is to avoid the glare caused by the brilliant edges ofthe perforations.

Still another object or my invention is to provide spectacles withperforated plates in which 25 the perforations are adjustable at will,such adjustment being equally effective over the hole area of the plate.3

According to my invention the plates are provided with fine parallelslits, disposed horizontal- 3o iy, the upper edge of each slitprojecting slightly beyond the lower edge thereof, and there isassociated with each such plate a rotatable plate, provided with slitsable to register with the slits of the first plate, the center ofrotation of the 35 said rotatable plate being preferably located alongone edge of one of the slits.

In the annexed drawingz- Fig. 1 is a front view of a. according to myinvention.

Fig. 2 is a cross-section thereof. 3 a Fig. 3 is a cross-section of amodification thereof. I

Figs. 4 and 5 are diagrammatical views illustrating the effect of theplate on the eye of the 5 wearer. v i Fig. 6 lsa partial sectional viewof a plate of the kind shown in Fig. 3, associated with a rotat ableplate, the latter being shown at the position corresponding to the fullopening.

Fig. '7 is a similar view at the position corresponding to the closedposition.

Fig. 8 isa partial front view at an intermediate position of the plate.

The circular plate shown plate for spectacles in Figs; 1 and 2 ismaterial such as 65 made of opaque or semi-opaque the frame. This second6 Claims. (Cl. 2-14) metal, strongly coloured cellulosic derivatives,synthetic resins, etc. This plate has a series of equidistant parallelslits I, separated from one another by plain portions 2 which areinclined with respect to the plane of the plate, the upper 5 edge ofeach slit thus projecting beyond the lower edge thereof, as in windowshutters, for

instance. Slits i are narrow and in large number.

Inthe modification of Fig. 3, the plain portions between the successiveslits comprise an upper 10 part 3 in the plane-of the plate and a lowerpart 4 inclined forward.

When plates such as described are mounted in the frame of a pair ofspectacles, they decrease the intensityof the light received by thewearers eyes without hindering clear vision owing to the fineness andproximity of the slits. They are not liable to break as the spectacleswithcoloured glass lenses and the slits are not so easily clogged as thecircular holes of the known perforated plates. The edges of the slitscannot receive-the rays B (Fig. 2) from the sun or from a brilliant sky.They are not therefore liable to become a source of glare. r

The angle of the beam of light passing through the slits l variesaccording to the inclination of the average visual ray with respect tothe plane of the plate. When the wearer raises his head (Fig. 4) theuseful angle a (angle of the beam admitted by a slit) is large withrespect to the dead angle 5-. the spectacles are clear. When thewearer's head is lowered (Fig. 5), the useful angle a' is reduced withrespect to the dead angle a; the spectacles are dim. The wearer is thusable to adjust at will the eflici'ency of the spectacles.

There is preferably associated with each plate as described. a secondplate rotatably. carried by plate 5 (Figs. 6 to '7) is provided withparallel slits 1 having substantially 40 the same width as the slits lof the fixed plate and disposed. at the same distance apart; but slits Ihave no, projecting edge. Plate -5 isdisposed against the inner face ofthe fixed plate.

. Plate 5 is preferably in the form of a disc loosely carried within thedisc being located at i and of a slit 1.

For a given angular position of the rotatable plate, the slits l and lof both plates are registering together (Fig. 6). The spectacles arethen very clear. By rotating plate 5 through the plain portions 0! plate5 are brought before the slits I of the fixedplate and the spectaclesare wholly opaque (Fig. '7). At any. interm diate 0 frame, the center ofthis 0 along the edge of a slit 1. Spectacles or goggles for personalwear comprising a frame, and plates of non-transparent material in saidframe provided with a plurality upp r d es of the said slits projectingbeyond the lower edges of fine parallel horizontal slits, the

thereof and the slits being so proportioned as to .leave narrow clearvision passages, for rays disposed normalto ,the plate.

2. ,Spectaclesor goggles for pers on al wear comor non-transparentprising a frame, and plates material in said frame provided with aplurality oi. fine parallel horizontal'slits, the plain portions betweenthe successive slits each comprising 7 an upper part in the plane 01'the plateand a \lower part oblique with respect to said plane andprojecting forward with respect to the wearer's eye, and the slits beingso proportionedas to leave narrow clear vision passages for raysdisposed normal to the plate.

3. A device for use in spectacles or goggles, comprising in combinationa fixed plate made of non-transparent materiaL, provided with fineparallel slits of equal widths; and a rotatable" plate disposed againstsaid fixed plate, said rotatbeing rotatable through an. are of 180throughout the entire entire area of the fixed plate.

4. In a device as claimed in claim 3, the center 0! rotation of saidrotatable plate being located along oneledgeof a slit on on saidrotatable plate, and the rotatable plate from the registering positionor the slits.

5. A device for use in spectacles or goggles,

comprising in. combination a fixed plate made of non-transparentmaterial, provided with fine parallel horizontal slits of equal widths,the material the upper edge oi each slit projecting forward with respectto the wearers eye while the material atthe lower edge of each slit issubstantially in the plane of said plate; and a rotatable plate disposedagainst the flush face of said fixed plate, said rotatable plate beingalso provided with cor responding slits which, Iora given angularposition of said rotatable plate, are in registration with the saidslits of said fixed plate, rotation of the rotatableplate'simultaneously equally afiect ing the sizes of the openingsbetween the slits area of the fixed plate.

6. In a device as claimed in claim 5, the center of rotation of saidrotatable plate being located along one edge of the material at a slitin said fixed plate and said rotatable plate, and said rotatable platebeing rotatable through an arc of 180 from the registering position oithe slits.

" LEON HEBRARD.

said fixed plate and

